A kind of bimetallic cast-welded composite roll and its preparation method

Abstract

The invention provides a manufacturing method for a bimetal cast-weld composite roller. The method comprises the following steps: casting an alloy steel roller core, performing surfacing on the surface after shot-blasting and clearing; performing induction heating for heating the alloy steel roller core with a surfacing layer, and casting molten-state alloy cast iron onto the surfacing layer, thereby forming a cast iron solidification layer; and finally, performing induction heating, enabling the cast iron solidification layer to bond with the surfacing layer on the surface of the alloy steelroller core in a metallurgical mode, thereby obtaining the bimetal cast-weld composite roller. The bimetal cast-weld composite roller manufactured by the method is high in alloy steel roller core strength, is good in toughness, is high in roller body hardness, is good in wear resistance, can bear relatively great rolling circulating stress, strong friction and extrusion, is not liable to peel offand have roller surface cracks; and the surfacing layer can guarantee metallurgical bonding between the surfaced alloy steel roller core and a cast roller body, is not liable to cause peel-off, can reduce bonding difficulty between the roller body and the roller core, and reduces the cost; and the length and the diameter of the roller core are not limited, so that the manufactured bimetal cast-weld composite roller is strong in selectivity.

Description

technical field [0001] The invention belongs to the technical field of rolls, and in particular relates to a bimetallic cast-welded composite roll and a preparation method thereof. Background technique [0002] Steel rolling mills are widely used in mining, metallurgy and other industries, and rolls are one of the main consumable spare parts in steel rolling production. Their quality not only affects the cost of steel rolling production and the production rate of rolling mills, but also affects the quality of rolled products to a large extent. The roll is the main deformation tool of the rolling mill. Due to its own material and its harsh working conditions, it often fails or even is scrapped. The main failure forms include cracks and peeling of the roll surface and roll breakage. The rolls in use, because the rolls are subjected to heavy rolling cycle stress, strong friction and extrusion, instantaneous high temperature and strong impact during the working process, are ofte...

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Problems solved by technology

This method uses low-injection production to waste metal. At the same time, it is difficult to ensure the integrity of the bonding area during the pouring process due to the similar melting points of the two steels. The metallographic diagram or SEM image shows that the composite interface bonding area is not smooth. The problem of cracks in the roll body produced by the machine is not easy to control. The roll body is prepared by the rapid cooling method, and the wear resistance and hardness of the roll body are poor.

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